Overview
CEN ISO/TR 52022-2:2017 (ISO/TR 52022-2:2017) is an informative technical report that explains and justifies the methods used to assess the thermal, solar and daylight properties of building components and elements. It does not introduce normative requirements; instead it clarifies the correct understanding and use of related calculation standards (ISO 10077‑1, ISO 10077‑2, ISO 12631, ISO 52022‑1 and ISO 52022‑3). Published in 2017 and approved by CEN, this TR supports the European set of EPB (energy performance of buildings) standards and the objectives of EU Directive 2010/31/EU.
Key topics
- Purpose & scope: explanatory background for the EPB standards to ensure consistent application across national/regional implementations.
- Thermal transmittance (U‑values): interpretation and examples for glazing, frames, shutters and curtain wall components (references to ISO 10077‑1/2 and ISO 12631).
- Numerical vs simplified methods: overview of the numerical method for frames (ISO 10077‑2) and simplified calculation approaches for solar/daylight characteristics (ISO 52022‑1) and detailed methods (ISO 52022‑3).
- Solar and daylight properties: guidance on calculating solar transmittance, daylighting and combined effects of glazing with solar protection devices (louvers, venetian blinds).
- Equivalent optical characteristics: methods to determine equivalent solar/light properties for complex devices (annexes include extended methodology).
- Worked examples & datasets: multiple informative annexes provide calculation examples, typical glazing/solar protection data and spreadsheet support to demonstrate methods.
Practical applications
- Building designers & façade engineers use the report to interpret calculation standards when assessing window systems, curtain walling and solar protection performance.
- Energy assessors & certifiers rely on the explanations to ensure consistent U‑value and solar/daylight input data for building energy performance calculations.
- Window, glazing and solar‑device manufacturers benefit from the guidance when preparing product data for energy ratings and compliance documentation.
- Regulators and policy makers can reference the TR when adopting EPB standards into regional/national rules (noting that mandatory choices may be made locally).
Related standards
CEN ISO/TR 52022-2:2017 is a practical, non‑normative resource to ensure consistent interpretation and application of standards for thermal transmittance, solar transmittance and daylight properties in building energy performance assessments.
